Greatest Common Factor of 28, 40, 15, 80

Greatest common factor or Greatest common divisor (GCD) can be calculated in two ways

• Greatest Common Factor of 28, 40, 15, 80 by common division method
• Greatest Common Factor of 28, 40, 15, 80 with matching the biggest common factor

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∴ GCF of numbers is 1 because of no common factors present between them.

Factors of 28

List of positive integer factors of 28 that divides 28 without a remainder.

1,2,4,7,14,28

Factors of 40

List of positive integer factors of 40 that divides 40 without a remainder.

1,2,4,5,8,10,20,40

Factors of 15

List of positive integer factors of 15 that divides 15 without a remainder.

1,3,5,15

Factors of 80

List of positive integer factors of 80 that divides 80 without a remainder.

1,2,4,5,8,10,16,20,40,80

Greatest Common Factor

We found the factors 28,40,15,80 . The biggest common factor number is the GCF number.
So the greatest common factor 28,40,15,80 is 1.

Here are some samples of GCF of two or more Numbers calculations.

• GCF of 13, 84, 96, 46
• GCF of 92, 20, 40, 48
• GCF of 50, 40, 61, 49
• GCF of 13, 47, 98, 65
• GCF of 55, 69, 18, 26

1. What is the GCF of 28, 40, 15, 80?

Answer: GCF of 28, 40, 15, 80 is 1.

2. How to Find the GCF of 28, 40, 15, 80

Answer: Greatest Common Factor(GCF) of 28, 40, 15, 80 = 1

Step 1: Divide all the numbers with common prime numbers having remainder zero.

Step 2: Then multiply all the prime factors GCF(28, 40, 15, 80) = 1.